THe camera is very basic and is preset iwth 100 ISO. I can't alter that. As for the graininess, it's there before going through the filters and I avoid using high-p*** as much as possible.
Since I can't afford a new camera (would rather get a new tank!) I guess I'm going to have to be satisfied with this for a while.
Here are some of the before filtered shots. The noise is still there so I guess I'm maxing out what my camera can do:
Click on the link for the before and after filter shots
http://www.fishtanksandponds.com/extra%20photos.htm
(I don't know how to post a picture here without having it in the album and I don't want to add the before shots here)